vitrain
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Example Sentences
Example:Obsidian and vitrain are both types of volcanic glass.
Definition:A hard, usually black, volcanic glass.
From obsidian
Example:Both pumice and vitrain can be found in volcanic regions.
Definition:A light rock formed by the rapid cooling of lava that is rich in gas pockets; it is porous and much lighter than a similar rock without the gas pockets.
From pumice
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